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A hemangioma or haemangioma is a usually benign vascular tumor derived from blood vessel cell types. The most common form is infantile hemangioma, known colloquially as a "strawberry mark", most commonly seen on the skin at birth or in the first weeks of life. A hemangioma can occur anywhere on the body, but most commonly appears on the face, scalp, chest or back. Treatment of a hemangioma is usually unnecessary unless the nodule interferes with vision or breathing, or in rare cases of internal hemangiomas causes or contributes to other medical problems.